Non-linear self-driven spectral tuning of Extreme Ultraviolet Femtosecond Pulses in monoatomic materials

Carino Ferrante; Emiliano Principi; Andrea Marini; Giovanni Batignani; Giuseppe Fumero; Alessandra Virga; Laura Foglia; Riccardo Mincigrucci; Alberto Simoncig; Carlo Spezzani; Claudio Masciovecchio; Tullio Scopigno

doi:10.1038/s41377-021-00531-8

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Non-linear self-driven spectral tuning of Extreme Ultraviolet Femtosecond Pulses in monoatomic materials

Letters

- Non-linear self-driven spectral tuning of Extreme Ultraviolet Femtosecond Pulses in monoatomic materials
- Light: Science & Applications Vol. 10, Issue 6, Pages: 950-956(2021)
- Affiliations：
  
  1.Graphene Labs, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy
  2.Center for Life Nano Science @Sapienza, Istituto Italiano di Tecnologia, Viale Regina Elena 291, I-00161 Roma, Italy
  3.Dipartimento di Fisica, Università di Roma "La Sapienza", Piazzale Aldo Moro 5, 00185 Roma, Italy
  4.ElettraSincrotrone Trieste S.C.p.A., SS 14-km 163.5, 34149 Basovizza, Trieste, Italy
  5.Dipartimento di Scienze Fisiche e Chimiche, Università degli Studi dell'Aquila, Via Vetoio, 67100 L'Aquila, Italy
- Author bio：
  
  Carino Ferrante (carino.ferrante@iit.it)
  Tullio Scopigno (tullio.scopigno@roma1.infn.it)
- Funds：
- DOI：10.1038/s41377-021-00531-8
  CLC：
- Published：30 June 2021，
  
  Published Online：28 April 2021，
  
  Received：11 September 2020，
  
  Revised：23 March 2021，
  
  Accepted：07 April 2021
- Accepted：
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Ferrante, C. et al. Non-linear self-driven spectral tuning of Extreme Ultraviolet Femtosecond Pulses in monoatomic materials. Light: Science & Applications, 10, 950-956 (2021).
DOI：

Ferrante, C. et al. Non-linear self-driven spectral tuning of Extreme Ultraviolet Femtosecond Pulses in monoatomic materials. Light: Science & Applications, 10, 950-956 (2021). DOI： 10.1038/s41377-021-00531-8.

摘要

Abstract

Self-action nonlinearity is a key aspect – either as a foundational element or a detrimental factor – of several optical spectroscopies and photonic devices. Supercontinuum generation

wavelength converters

and chirped pulse amplification are just a few examples. The recent advent of Free Electron Lasers (FEL) fostered building on nonlinearity to propose new concepts and extend optical wavelengths paradigms for extreme ultraviolet (EUV) and X-ray regimes. No evidence for intrapulse dynamics

however

has been reported at such short wavelengths

where the light-matter interactions are ruled by the sharp absorption edges of core electrons. Here

we provide experimental evidence for self-phase modulation of femtosecond FEL pulses

which we exploit for fine self-driven spectral tunability by interaction with sub-micrometric foils of selected monoatomic materials. Moving the pulse wavelength across the absorption edge

the spectral profile changes from a non-linear spectral blue-shift to a red-shifted broadening. These findings are rationalized accounting for ultrafast ionization and delayed thermal response of highly excited electrons above and below threshold

respectively.

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